package com.bzd.util;

import com.bzd.exception.ParamException;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.apache.commons.collections.MapUtils;

import javax.validation.ConstraintViolation;
import javax.validation.Validation;
import javax.validation.Validator;
import javax.validation.ValidatorFactory;
import java.util.*;

/**
 * Created by Admin on 2020/1/3
 */
public class BeanValidator {
    private static ValidatorFactory validatorFactory=Validation.buildDefaultValidatorFactory();

    public static <T> Map<String, String> validate(T t, Class... groups) {
        Validator validator=validatorFactory.getValidator();
        Set validateResult=validator.validate(t, groups);
        if (validateResult.isEmpty()){
            return Collections.emptyMap();
        }else {
            LinkedHashMap errors =Maps.newLinkedHashMap();
            Iterator iterator =validateResult.iterator();
            while (iterator.hasNext()){
                ConstraintViolation violation =(ConstraintViolation) iterator.next();
                errors.put(violation.getPropertyPath().toString(),violation.getMessage());
            }
            return errors;
        }
    }

    public static Map<String,String> validateList(Collection<?> collection){
        Preconditions.checkNotNull(collection);
        Iterator iterator = collection.iterator();
        Map errors;
        do {
            if (!iterator.hasNext()){
                return Collections.emptyMap();
            }
            Object object = iterator.next();
            errors = validate(object,new Class[0]);

        } while (errors.isEmpty());
        return errors;
    }

    public static Map<String,String> validateObject(Object first,Object... objects){
        if (objects != null && objects.length > 0) {
            return validateList(Lists.asList(first, objects));
        }else {
            return validate(first, new Class[0]);
        }
    }

    public static void check(Object param) throws ParamException {
        Map<String,String> map = BeanValidator.validateObject(param);
        if (MapUtils.isNotEmpty(map)){
            throw new ParamException(map.toString());
        }
    }
}
